Generally, you can take a blood test for pregnancy about 10 days after intercourse during ovulation, but there are individual differences. Ovulation increases the chances of pregnancy in women of childbearing age. Fertilization is completed within 24 hours of ovulation, and the fertilized egg is deposited in the uterine lining 6 to 7 days after fertilization. The embryonic trophoblast cells start to secrete human chorionic gonadotropin (HCG) 1 day after the implantation, so you can take a blood test to check for pregnancy about 10 days after intercourse, but some women need to take a blood test for a longer period of time in order to determine the pregnancy. After the pregnancy is confirmed by the HCG test, an ultrasound can be done at about 6 weeks after menopause to determine the intrauterine pregnancy, and the size of the embryo can be used to check the week of pregnancy. During early pregnancy, it is important to avoid heavy labor and strenuous exercise to avoid increasing the risk of miscarriage, and to take folic acid as prescribed by the doctor, as well as to take obstetric tests on time.